1/3x^2-5=7 what is x

Mathematics

1 answer:

Mnenie [13.5K]3 years ago

3 0

Answer:

x= 6

Step-by-step explanation:

$\frac{1}{3}x^{2}-5=7\\$

Add 5 to both sides

$\frac{1}{3}x^{2}-5+5=7+5\\\\\frac{1}{3}x^{2}=12\\$

Multiply both sides by 3

$3*\frac{1}{3}x^{2}=12*3\\\\x^{2}=36\\$

x² = 6*6

Take square root,

√x² =√6*6

x = 6

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